Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2006COBALT SS, 4D SEDAN, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 815 (WIRING SYSTEMS AND POWER MANAGEMENT - DIAGNOSTIC INFORMATION AND PROCEDURES)DIAGNOSTIC INFORMATION AND PROCEDURESPOWER MODE MISMATCHCIRCUIT/SYSTEM TESTING
2006 Chevrolet Cobalt SS, 4D Sedan, Standard
Circuit/System Testing
2006 Chevrolet Cobalt SS, 4D Sedan, StandardSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2010 Pontiac G5 and 2010 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
- Connect a test lamp between each fuse test terminal of the ignition switch B+ circuit fuse and ground. The test lamp should illuminate.
- If the test lamp does not illuminate, test the ignition switch circuits listed below for a short to ground. If all circuits test OK, replace the BCM.
- B+ terminal 2
- Ignition terminal 4
- Ignition terminal 3
- Ignition terminal 5
- If the test lamp does not illuminate, test the ignition switch circuits listed below for a short to ground. If all circuits test OK, replace the BCM.
- Disconnect the harness connector at the ignition switch.
- Connect a test lamp between the B+ circuit terminal 2 and ground. The test lamp should illuminate.
- If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
- Perform the ignition switch component test. Verify the switch passes the test.
- If the ignition switch does not test normal, replace the ignition switch.
- Disconnect X2 and X4 harness connectors at the BCM, test for less than 1.0 volt between the circuit terminals of the BCM listed below and ground:
- Ignition terminal C8, X4
- Ignition terminal D3, X4
- Ignition terminal 56, X2
- If greater than specified, test the circuit for a short to voltage.
- Test for less than 1.0 ohm between the BCM and the ignition switch on the circuits listed below:
- Ignition terminal C8, X4 and 4
- Ignition terminal D3, X4 and 3
- Ignition terminal 56, X2 and 5
- If greater than specified, test the circuit for open/high resistance.
- If all circuits test normal, replace the BCM.
IMPORTANT:
You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
IMPORTANT:
The ignition switch component test must be performed before proceeding with this test to verify the integrity of the switch.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.